ScissorRect for DModelPanel

Adds a scissor rect to the DModelPanel Paint hook which prevents the
drawn model from "leaking" outside of the area of the DModelPanel which
is being drawn.
Added new NPCs and merged EP2 NPCs
Added Jalopy
Merged Magnusson and added Alyx Gun
Delete game_ep2.lua
Fixed the Jalopy going into the chairs category
Find out how to add helicopter grenade skin 2
Fix table.Copy erroring on tables with __metatable

table.Copy errors on tables with the __metatable metamethod set to a non-table, because it would call setmetatable with the value of __metatable instead of the actual metatable.
Merge pull request #635 from Xandaros/patch-1

Fix table.Copy erroring on tables with __metatable
Fix Spawnmenu Save button not showing

This also causes a bug in the spawn menu where the save button doesn't show up. To recreate:
- Create two spawnlists, into one of them move any spawn icon
- Click on the save button
- Move the item between the two spawnlists

The save button doesn't appear now, but it should as the list changed. 

This happens because the check in DropAction_Normal in line 88 passes, which calls DropAction_Simple. In DropAction_Simple the OnModify call isn't present, while in DropAction_Normal it is (l. 142)
Spacing fixes
More spacing
Merge pull request #637 from Kamshak/patch-1

Fix Spawnmenu Save button not showing
Merge pull request #632 from Kefta/master

Added NPCs and deleted game_ep2.lua
Moved viewmodel position handling from CalcView to CalcViewModelView
Small fixes and changes

* Moved the menu bar stuff to one file for several reasons
* Fix for https://github.com/Facepunch/garrysmod-issues/issues/887
* Made so that editing presets doesn't remove default presets set by the
CPanel
* Aligned tabulation with Notepad++, since it's the most used for GLua
Removed one more file from send.txt
Merge pull request #638 from robotboy655/patch1

Small fixes and changes
Fixed a crash exploit with Thruster tool
Merge pull request #641 from robotboy655/crashfix

Fixed a crash exploit with Thruster tool