internal: introduce new types to avoid unsigned int rollover and signed int overflow (#7216)

* framebuffer: avoid gluint overflow

GLuint was being initialized to -1 and rolling over to unsigned int max,
its defined behaviour but very unnecessery. add a bool and use it for
checking if allocated or not.

* opengl: avoid gluint rollover

-1 rolls over to unsigned int max, use 0xFF instead.

* core: big uint64_t to int type conversion

there were a few uint64_t to int implicit conversions overflowing int
and causing UB, make all monitor/workspaces/windows use the new
typedefs. also fix the various related 64 to 32 implicit conversions
going around found with -Wshorten-64-to-32

src/managers/input/Swipe.cpp

@@ -77,7 +77,7 @@ void CInputManager::endWorkspaceSwipe() {
     // left of where we started.  Instead, it's one more than the greatest
     // workspace ID that currently exists.
     if (workspaceIDRight <= m_sActiveSwipe.pWorkspaceBegin->m_iID && *PSWIPENEW) {
-        int maxWorkspace = 0;
+        WORKSPACEID maxWorkspace = 0;
         for (const auto& ws : g_pCompositor->m_vWorkspaces) {
             maxWorkspace = std::max(maxWorkspace, ws->m_iID);
         }