build: Update Windows to Qt5.15 (#798)

* Update compile howto

- to qt5.15
- minimal install overhead
- sync with vscode and cmake

* Update docs with more input

gh actions windows: Qt5.15 and msvc2019

* fix: Azure build

.vscode/c_cpp_properties.json

@@ -17,7 +17,7 @@
             "name": "Win32",
             "includePath": [
                 "${workspaceFolder}/**",
-                "G:/Programme/Qt/5.14.1/msvc2017_64/include/**"
+                "C:/Qt/5.15.0/msvc2019_64/include/**"
             ],
             "defines": [
                 "_DEBUG",

.vscode/hyperion.code-workspace

@@ -7,8 +7,6 @@
 	"settings": {
 		"editor.formatOnSave": false,
 		"cmake.environment": {
-			"Qt5_DIR":"G:/Programme/Qt/5.14.1/msvc2017_64/lib/cmake/Qt5",
-			"CMAKE_PREFIX_PATH": "G:/Programme/Qt/5.14.1/msvc2017_64"
 		},
 	},
 	"extensions": {

.vscode/launch.json

@@ -27,7 +27,7 @@
       "name": "(Windows) hyperiond",
       "type": "cppvsdbg",
       "request": "launch",
-      "program": "${workspaceFolder}/build/bin/hyperiond.exe",
+      "program": "${workspaceFolder}/build/bin/Debug/hyperiond.exe",
       "args": [],
       "stopAtEntry": false,
       "cwd": "${workspaceFolder}",