ISLE and mingw32 fixes (#18)

* ci: no need to do a final cd

* MxDSAction has a setAtomId method

* Implement the MxOmniCreateParamBase destructor inline

Because of this, ISLE should no longer have to compile mxomnicreateparambase.obj.
I didn't modify isle.mak, because I don't have the MSVC 4.20 GUI set-up.

* Replace 256 with sizeof(...)

* Format DefWndProc calls in WndProc

* Replace magic mask in WNDPROC with macro's

* Replace magic numbers in main.cpp with macro's

* MOUSEMOVE notification id is 10 instead of 0x10

* Lowercase all windows includes such that mingw32 on Linux can find these

* Convert ISLE/res/isle.rc to utf-8, and add a comma needed by mingw32

* mingw32 cannot use a enum without previous declaration

* minor adjustments

---------

Co-authored-by: itsmattkc <34096995+itsmattkc@users.noreply.github.com>

.github/workflows/build.yml

@@ -32,8 +32,7 @@ jobs:
         C:\msys64\usr\bin\wget.exe https://archive.org/download/idx5sdk/idx5sdk.exe
         7z x .\idx5sdk.exe
         7z x .\DX5SDK.EXE
-        cd cdrom
-        
+
     - name: Cache DX5 SDK
       if: steps.cache-dx5.outputs.cache-hit != 'true'
       id: save-dx5
@@ -41,13 +40,13 @@ jobs:
       with:
         path: dx5sdk
         key: dx5sdk
-        
+
     - name: Setup DX5 SDK
       run: |
         cd dx5sdk
         cd cdrom
         .\SETUP.EXE /s
-        
+
     - name: Build
       shell: cmd
       run: |