Fix a bug in the *.spec files and also apply the following major changes:

- Add support for adding the base folder to PATH.
- Only display one pop up window at a time in order to avoid confusion.
- Add automatic updates feature:
	- Windows and Linux versions will be shipped with an updater program used to
	  update both Artemis and the updater itself.
	- MacOs versions will not have the updater. Instead the user will be asked
	  to download the new software version (if present) via browser.

src/updater.py

@@ -0,0 +1,200 @@
+import argparse
+import os
+import os.path
+import sys
+from PyQt5.QtCore import QObject, QProcess
+from PyQt5.QtGui import QPixmap
+from PyQt5.QtWidgets import QApplication, qApp
+from download_window import DownloadWindow
+from constants import Constants, DownloadTarget
+from downloadtargetfactory import get_download_target
+
+
+__VERSION__ = "0.0.1"
+
+
+# Global stylesheet.
+stylesheet = """
+/*************************************
+Main Window and Splitters
+**************************************/
+QWidget:window {
+    background-color: #29353B;
+}
+
+/*************************************
+Main menu (Bar)
+**************************************/
+QMenuBar {
+    background-color: transparent;
+    color: #AFBDC4;
+}
+
+QMenuBar::item {
+    background-color: transparent;
+}
+
+QMenuBar::item:disabled {
+    color: gray;
+}
+
+QMenuBar::item:selected {
+    color: #FFFFFF;
+    border-bottom: 2px solid #88cc00;
+}
+
+QMenuBar::item:pressed {
+    color: #FFFFFF;
+    border-bottom: 2px solid #88cc00;
+}
+
+QToolBar {
+    background-color: transparent;
+    border: 1px solid transparent;
+}
+
+QToolBar:handle {
+    background-color: transparent;
+    border-left: 2px dotted #80CBC4;
+    color: transparent;
+}
+
+QToolBar::separator {
+    border: 0;
+}
+
+QMenu {
+    background-color: #263238;
+    color: #AFBDC4;
+}
+
+QMenu::item:selected {
+    color: #FFFFFF;
+}
+
+QMenu::item:pressed {
+    color: #FFFFFF;
+}
+
+QMenu::separator {
+    background-color: transparent;
+    height: 1px;
+    margin-left: 10px;
+    margin-right: 10px;
+    margin-top: 5px;
+    margin-bottom: 5px;
+}
+
+
+/*************************************
+Progressbar
+**************************************/
+QProgressBar
+{
+    border: 2px solid grey;
+    border-radius: 5px;
+    text-align: center;
+}
+
+QProgressBar::chunk
+{
+    background-color: #88cc00;
+    width: 2.15px;
+    margin: 0.5px;
+}
+
+/*************************************
+Labels and Rich Text boxes
+**************************************/
+QLabel {
+    background-color: transparent;
+    color: #CFD8DC;
+}
+
+QDialog {
+    background-color: transparent;
+    color: #949a9c;
+}
+
+QTextBrowser {
+    background-color: transparent;
+    color: #949a9c;
+}
+
+/*************************************
+Buttons
+**************************************/
+QPushButton {
+    background-color: transparent;
+    color: #AFBDC4;
+    border: 1px solid transparent;
+    padding: 4px 22px;
+}
+
+QPushButton:hover {
+    border-left: 2px solid #88cc00;
+    border-right: 2px solid #88cc00;
+    color: #FFFFFF;
+}
+
+QPushButton:pressed {
+    color: #FFFFFF;
+}
+
+QPushButton:disabled {
+    color:#546E7A;
+}
+
+QPushButton:checked {
+    color: #88cc00;
+}
+"""
+
+
+class _ArtemisUpdater(QObject):
+    """Updater of the main software."""
+
+    def __init__(self, target):
+        super().__init__()
+        self.target = get_download_target(DownloadTarget.SOFTWARE, target)
+        self.download_window = DownloadWindow()
+        self.download_window.setStyleSheet(stylesheet)
+        self.download_window.cancel_btn.clicked.connect(qApp.quit)
+        self.download_window.complete.connect(self.start_main_program)
+
+    def start(self):
+        """Close the main program and start the download."""
+        self.download_window.activate(self.target)
+
+    def init_ok(self):
+        return self.target.url and self.target.hash_code and self.target.size > 0
+
+    def start_main_program(self):
+        """Restart the (updated) main program and close the updater."""
+        self.download_window.setVisible(False)
+        artemis = QProcess()
+        try:
+            artemis.startDetached(Constants.EXECUTABLE_NAME)
+        except BaseException:
+            pass
+        qApp.quit()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(prog='Artemis Updater')
+    parser.add_argument("url", nargs="?", default="", type=str, help="Download url")
+    parser.add_argument("hash_code", nargs="?", default="", type=str, help="sha256 of the file")
+    parser.add_argument("size", nargs="?", default=0, type=int, help="Size (KB) of the file")
+    parser.add_argument('--version', action='version', version=__VERSION__)
+    args = parser.parse_args()
+
+    my_app = QApplication(sys.argv)
+    ARTEMIS_ICON = os.path.join(":", "icon", "default_pics", "Artemis3.500px.png")
+    img = QPixmap(ARTEMIS_ICON)
+    updater = _ArtemisUpdater(args)
+
+    if not updater.init_ok():
+        updater.start_main_program()
+    else:
+        updater.start()
+        sys.exit(my_app.exec_())