Adds dev build changelog.

CHANGELOG.md

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+# QB64 dev build - Changelog
+
+## New features
+### All platforms
+- `_Source` is now also set to `_Console` when `$Console:Only` is used.
+- Quick reference for commands is now shown in the status bar when syntax errors are detected.
+- New `$DEBUG` metacommand, with added breakpoint/step abilities to the IDE.
+
+### Windows
+- Automatically embeds a manifest file when compiling an exe with `$VERSIONINFO`, so that Common Controls v6.0 gets linked at runtime.
+- Adds the %TEMP%, Program Files and Program Files (x86) directories to `_DIR$()` folder specifications.
+
+<!--- 
+### macOS
+
+### Linux
+--->
+
+## Fixes
+### All platforms
+- Improved wiki parser.
+- Contextual menu would crash when right-clicking a series of high-ascii characters.
+- Fixes an issue with passing an array as a Sub/Function argument (missing parenthesis now properly detected).
+- Fixes `Clear` making `$Console` mode invalid.
+- Fixes a syntax highlighter issue regarding scientific notation.
+- Fixes an issue in Windows Vista and up with incorrect resolution returned on a scaled desktop.
+- Fixes `Const` parser (no string functions allowed).
+- Fixes `InKey$` acting too slow in Linux.
+- Explicitly sets x87 fpu to extended precision mode.
+- Removes 255 character limit for INPUT/LINE INPUT with strings.
+- Fixes DATA commands failing to compile in some circumstances.
+
+### Windows
+- Allows $CONSOLE:ONLY programs to return `_WINDOWHANDLE`.
+
+<!---
+### macOS
+--->
+
+### Linux
+- `xmessage` added to dependency list (setup script).
+<!---
+- Patches condition that would leave zombie processes behind when using `Shell _DontWait`.
+--->