This reverts commit 2e146309.

Fixed: flipped +USEACTORPITCH direction for recent GZDoom versions;  this can be reverted by putting "buggymodeldefpitch = true;" in the game configuration for your specific projects if they are using old GZDoom versions.  Note: already added for Zandronum.

Changed, General interface: all main menu toolbars are now visible when starting the editor for the first time.
Changed, General interface: "Prefabs" and "Edit" menus are now hidden when no map is loaded.
Changed, General interface: moved "Dynamic Grid Size" menu item to the "Edit" menu, also moved the button to the matching position on the toolbar.
Changed, General interface: changed "Show Comments" menu item position in the "View" menu, also moved the button to the matching position on the toolbar.
Game configurations: removed "gamedetect" block, because it was unused by the editor.
Updated documentation ("Map Format Settings" page).

Game configurations, Strife, Doom map format: several thing flags were named incorrectly.
Game configurations, Strife, Doom map format: several linedef flags were listed as "Unknown".
Edit Selection mode: 15-degree rotation steps require more precision...

Changed, Numeric textboxes: you can now hold Ctrl or Shift keys while clicking a textbox buttons or using mouse wheel on a textbox to change value increment step.
Changed, Numeric textboxes: trailing zeros are no longer displayed to reduce visual noise.
Fixed, paired numeric controls: in some cases culture-specific decimal separator was not used.
Fixed, map loading: inability to initialize D3D device is now handled a bit more gracefully.
Fixed, main toolbar context menu: we should suppress context menu closing only when user clicks on a menu item while holding Shift key.
Fixed, Game configurations: several Skulltag things were not included in many Zandronum game configurations.

Configurations: increased game configuration loading speed (in previous builds it took ~650 ms. to load a single game configuration, now it takes ~120 ms. to load all 64 of them). As a side effect, New\Open Map Options, Map Options and Game Configurations windows are now opened noticeably faster. The editor starts up a bit faster as well.
Configurations: all 64 game configuration are now available by default.
Game Configurations window: game configurations can now be disabled. This setting is mostly cosmetic. When a game configuration is disabled, it won't be shown in "game configuration" dropdowns in New\Open Map Options and Map Options windows. If a map's .dbs file specifies a disabled configuration, it will be picked as a map configuration anyway.
Linedefs mode: vertex insert preview logic used Highlight range instead of Stitch range (which is used when draw mode engages).
Visual mode: double-sided middle textures were not selected when using "Select" action with "with same texture" modifier.
Textures: some optimizations in patch blending code.
ZDoom ACS script configuration: added definitions for StrLeft, StrMid and StrRight functions.

Sector Edit form, Vertex Edit form: fixed a crash when updating sector/vertex properties in Visual mode.
Reorganized game configurations.

Floor and ceiling textures are now moved more predictably by arrow keys in GZDoom Visual mode.
Walls texture coordinates are always rounded when moved by arrow keys in Visual modes.
Linedef info panel: relative UDMF light values are now shown like this: 16 (128), which means "UDMF light value" ("total surface brightness (UDMF light value + sector brightness)")
Player is now spawned at camera height when testing from current location in Visual modes.
Focus is now properly restored after testing from current location in Visual modes.
Updated Heretic_sectors.cfg and Heretic_things.cfg as described here: http://www.doombuilder.com/forums/viewtopic.php?f=11&t=357
Changed sprites of artifacts in Hexen_things.cfg to proper ones.
Renamed Skulltag configs to Zandronum

No commit message