Remove view.qc and modelevent.qc

Rebuild against FreeHL Develop

Remove base/src dependency and use valve/src's versions instead.

add instructions.txt file

Removal of Game_Input which has been made obsolete.

Remove obsolete includes.

Remove references to client/player.qc.

Set pragma target fte_5768

player class: Use parent method OptimiseChangedFlags() to cull some fields from being networked to players other than yourself

Clean up our player enumflags.

Remove inclusion of pmove_water.qc and rules.qc

Remove mention of GS_RENDERFX.

Adjust naming against upstream.

Convert all classes to use the new parent names. The old ones were marked for deprecation long ago.

Implement IsMultiplayer() into HLGameRules class.