Update Windows build scripts

src/scripts/build_qscintilla.bat

@@ -0,0 +1,16 @@
+@echo off
+
+REM ### BUILD QSCINTILLA FOR FRICTION
+REM # Copyright (c) Friction contributors
+REM # GPLv3+
+
+set CWD=%cd%
+set SRC_DIR=%CWD%\src
+set QT_DIR=%SRC_DIR%\qt
+set QSCINTILLA_DIR=%SRC_DIR%\qscintilla
+
+set PATH=%ProgramFiles%\CMake\bin;%QT_DIR%\bin;%PATH%
+
+cd "%QSCINTILLA_DIR%\src"
+%QT_DIR%\bin\qmake.exe CONFIG+=release
+nmake

src/scripts/build_qt5.bat

@@ -0,0 +1,17 @@
+@echo off
+
+REM ### BUILD QT 5.15 FOR FRICTION
+REM # Copyright (c) Friction contributors
+REM # GPLv3+
+
+set CWD=%cd%
+set SRC_DIR=%CWD%\src
+set QT_DIR=%SRC_DIR%\qt
+set QT_V=5.15.12
+
+set PATH=%ProgramFiles%\Python311;%ProgramFiles%\CMake\bin;%PATH%
+
+cd "%SRC_DIR%\qt-everywhere-src-%QT_V%"
+nmake
+nmake
+nmake install

src/scripts/configure_qt5.bat

@@ -0,0 +1,15 @@
+@echo off
+
+REM ### CONFIGURE QT 5.15 FOR FRICTION
+REM # Copyright (c) Friction contributors
+REM # GPLv3+
+
+set CWD=%cd%
+set SRC_DIR=%CWD%\src
+set QT_DIR=%SRC_DIR%\qt
+set QT_V=5.15.12
+
+set PATH=%ProgramFiles%\Python311;%ProgramFiles%\CMake\bin;%PATH%
+
+cd "%SRC_DIR%\qt-everywhere-src-%QT_V%"
+configure.bat -release -prefix "%QT_DIR%" -mp -platform win32-msvc -opensource -confirm-license -nomake examples -nomake tests -opengl desktop -optimize-size -no-pch -no-glib -no-dbus -no-avx2 -no-avx512 -strip -no-openssl -no-gif -no-ico -schannel -skip qt3d -skip qtcharts -skip qtconnectivity -skip qtdatavis3d -skip qtdoc -skip qtgamepad -skip qtgraphicaleffects -skip qtlocation -skip qtlottie -skip qtnetworkauth -skip qtpurchasing -skip qtquick3d -skip qtquickcontrols -skip qtquickcontrols2 -skip qtquicktimeline -skip qtremoteobjects -skip qtscript -skip qtscxml -skip qtsensors -skip qtserialbus -skip qtserialport -skip qtspeech -skip qtvirtualkeyboard -skip qtwebchannel -skip qtwebengine -skip qtwebglplugin -skip qtwebsockets -skip qtwebview -skip qtxmlpatterns -skip qttools