Potential memory leaks identified by KSPCommunityFixes

[StonesmileGit]

Latest version of KSPCommunityFixes reports on some potential memory leaks on scene changes. A quick look in the log shows 10 potential locations in Principia where a leak might exist.

[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIAstronautComplexSpawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIAstronautComplexDespawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIRnDComplexSpawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIRnDComplexDespawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIMissionControlSpawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIMissionControlDespawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIAdministrationFacilitySpawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.886] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a onGUIAdministrationFacilityDespawn GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.887] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a OnHideUI GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.
[LOG 10:43:58.887] [KSPCF:MemoryLeaks] A destroyed principia.ksp_plugin_adapter:PrincipiaPluginAdapter instance is owning a OnShowUI GameEvents callback. No action has been taken, but unless this mod is relying on this pattern, this is likely a memory leak.

[pleroy]

In OnAwake we add a bunch of GameEvents callbacks and of TimingManager callbacks.

In OnDisable we remove the TimingManager callbacks but we forget about the GameEvents callbacks.

I wonder if we could do the RAII thing to avoid this kind of glitch.