[tools, cmake] refactor: update/hash check scripts, use tags for some more deps, proper CPMUtil separation (#2666)

Uses tags for a bunch of deps that can use them

Also adds a bunmch of scripts to tools/cpm, notably for checking hashes
and checking for updates.

TODO for the future:
- CI target to check hashes
- Weekly CI to check for updates

Need to get that other CI runner up

additional stuff

- Ports gentoo fixes
- makes solaris work (TODO: sdl2)
- way better docs
- properly separates CPMUtil as a standalone project

Reviewed-on: #2666
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

CMakeModules/CPM.cmake

@@ -743,9 +743,11 @@ function(CPMAddPackage)
     if(NOT DEFINED CPM_ARGS_NAME)
       set(CPM_ARGS_NAME ${nameFromUrl})
     endif()
-    if(NOT DEFINED CPM_ARGS_VERSION)
-      set(CPM_ARGS_VERSION ${verFromUrl})
-    endif()
+
+    # this is dumb and should not be done
+    # if(NOT DEFINED CPM_ARGS_VERSION)
+    #   set(CPM_ARGS_VERSION ${verFromUrl})
+    # endif()
 
     list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS URL "${CPM_ARGS_URL}")
   endif()