Improved handling of changing input boxes in slope arching form

Improved functionality

Edit Selection Mode: fixed a bug where the control sectors of sloped 3D floors were not updated correctly when one 3D floor was applied to multiple sectors

Fixed some more cases where UniValues were set to floats. Added throwing exceptions to the UniValue constructor (gasp!)

Removed lots of unnecessary casts to float of the Math methods. Also removed some other minor implicit casts

Edit Selection Mode: rotating sectors with plane equation slopes now works correctly if the sectors are not rectangular

Edit Selection Mode: slopes of 3D floor control sectors are now properly updated when moving/rotating sectors (only when not pasting)

Fixed an issue in Edit Selection Mode that could cause Out Of Memory exceptions with vertices that are slightly off grid in the 32 bit version

Using Edit Selection Mode on sectors with plane equation slopes works correctly now (flipping still doesn't work)

Decoupled plane equation slopes from sector heights. This means that changing sector heights will not change those slopes (use the offset box in the "slope" tab of the Edit Sector Dialog instead)

Added option to lock texture offsets of 3D floors when dragging the tagged sectors

Texture browser: input boxes don't lose focus anymore when the mouse is moved into the texture list area. Fixes #369.

Changed the ambient sound drop down menu of ambient sound things to natural sort order. Resolves #406.

Fixed a crash that happened when the script window is opened but minimized, the script has syntax errors, and then the map is saved. Fixes #402.

3D Floor Mode: allow pasting for texture names with more than 8 characters in the 3D floor editing window

Move vpo native code into BuilderNative as it is easier to manage. The plugins folder doesn't support including native dlls properly anyway.
Fix visplane explorer busy looping when waiting for data and reduce the used core count to 75% of the total available
Made vpo native code thread safe, removing the need for ungodly DLL patching hacks

Significantly reduced video memory usage when pasting sectors. Should also significantly increase speed when pasting many sectors. Fixes #400.

Fixed a bug where the DECORATE parser got confused by wrong tokens after starting the states definition. Fixes #374.

Fixed multi select in 3D Floor Mode to work when starting to drag inside a sector