map edit kinda overhauled

changes

the brush size is now 1 to 8 instead of 1 to 5. size 1 is one hex, size 2 is 7, size 3 is 19, etc. Ctrl+scroll also changes the size
added Rect and Circle shapes alongside the brush. they work with Paint, Erase and Select. Rect uses opposite corners, Circle goes from a center out to the hex you release on. both apply on release
paint previews are green, erase previews are red, and selection previews are yellow. selected tiles get a blue overlay
added tool hotkeys: B for Paint, E for Erase and Q for Select
Esc cancels a drag. Rect and Circle do nothing if cancelled, while a brush stroke gets reverted instead of leaving half the changes behind
loading a map now prompts before discarding a dirty map, and successfully creating or loading a map clears the old undo history

Select now supports click and drag, Shift+drag to add to the selection and Ctrl+drag to remove from it
the toolbar shows the selection count and has Clear and Delete buttons. Delete removes all selected tiles in one undo step
the Tile Editor can edit the type and walkability of the whole selection at once. when selected tiles differ, the controls show mixed values etc.
material editing only appears when every selected tile shares a type. Override Current Type changes the material for every tile using that type, while Save as New Type assigns a matching type to the selection without changing every other tile using the old type
brush strokes, Rect/Circle fills, deletes and bulk type or walkability changes are each grouped into one undo step. changing a type’s material itself is still not undoable….

logging now has a sink system, so the same formatted log messages can go to different outputs
the editor now has separate Logs and ObSL panels. engine/application logs go to Logs now, and script stdout goes to ObSL
the panels have Clear and Copy buttons and keep the latest 2000 lines. the UI sink buffers incoming logs under a mutex before the editor consumes them

closing the window now goes through a callback, so unsaved scene or project changes trigger the save/discard prompt instead of immediately closing
removed the old global Esc-to-quit shortcut.
ObSL’s CloseWindow() no longer closes the editor while in Editor mode. it logs that it was called instead. in the runtime, it still closes the window

enabled /MP for MSVC builds, and the editor/runtime targets use the Windows GUI subsystem so they don’t launch with a console window attached
atomic file writes now write the byte buffer explicitly and retry Windows file replacement when it fails with access-denied or sharing-violation errors, for up to about 2 seconds
a bit of cleanup around collision pair sorting, const-correctness and naming

updated the editor guide and screenshot to cover the new tools, shapes, selection controls, shortcuts and undo behavior. blah blah

…map editing is finally a lot less barebones…