Quality of life (#50)

* updated requirements.txt according to GRIMM's instructions

* added launch configuration and build tasks for VS Code

* updated build scripts and documentation

Generator/build.bat

@@ -1,4 +1,15 @@
-call .\venv\Scripts\activate.bat
+IF EXIST ".\venv" (
+  call .\venv\Scripts\activate.bat
+) ELSE (
+  IF EXIST "..\.venv" ( 
+    rem try to activate venv from root directory (VS Code default)
+    call ..\.venv\Scripts\activate.bat
+  ) ELSE (
+    echo "venv not found. Please create a virtual environment and activate it."
+    pause >nul
+    exit
+  )
+)
 echo activated python venv.
 
 pyuic5 -x MissionGeneratorUI.ui -o MissionGeneratorUI.py
@@ -10,4 +21,6 @@ echo compiled ui resource files.
 echo building exe with pyinstaller...
 pyinstaller MissionGenerator.spec --distpath ..\ --clean
 
-pause >nul
+if not %1=="-nopause" (
+  pause >nul
+)