Fully implement `resizeactivewindow` dispatcher for tiled and floating windows

[github-usr-name]

Overview

The resizeactivewindow implementation in v0.34.0 was incomplete and only allowed tiled windows to be grown, not shrunk. It was possible to workaround this by changing focus to a sibling node and then growing that node, but this is clunky and inefficient. This PR provides the missing functionality so that the resizeactivewindow dispatcher works similarly to the dwindle layout and i3/sway. It also implements resizeactivewindow for floating windows, using the same logic as the master layer.

Trivia:

• Ignore .vscode directory and all log files
• Remove gcc warnings by
  • Adding default cases with explicit returns as required (shouldn't be triggered unless the enum parameter was invalid anyway)
  • Surround a code block reached via an unused label with a #ifdef and provide cmake option

Changes:

• Add logic to determine the edge which should be moved [resized] based on current node position as well as requested delta
• Factor-out Hy3Node tree walk (which was repeated in several places in Hy3Layout.cpp) into Hy3Node member findSibling
• Factor-out Hy3Node resize logic into utility function in Hy3Layout, re-use for both inner- and outer- nodes
• Minor refactoring of Hy3Layout::resizeActiveWindow to use nested if blocks as guards instead of having multiple returns, which I find easier to comprehend when reading the code

[github-usr-name]

This has had reasonable amount of adhoc testing with 3-deep nested groups of various types without any stability or display issues. Valgrind doesn't report any memory leaks. The "which edge should we move?" detection logic would benefit from improvement because the centre window in a 3x3 matrix always gets expanded as consequence of the somewhat naive algorithm ("Is there space available in the direction of the delta? Great, let's move that edge then") always picking that edge. Nevertheless, I think it's a big usability improvement. I have a few thoughts about possibly adding either an additional dispatcher which would permit explicit specification of the edge to be resized, and/or adding eRectCorner m_anchor to Hy3Node (defaulting to CORNER_NONE with a semantic meaning of auto)

[github-usr-name]

Changelog updated & #ifdev removed - apologies, I don't know your versioning workflow, will bear that in mind for future.

Expanded node resize breakage - bollocks, that's annoying, thank you for spotting the mouse-resize regression. Going to be AFK till the weekend though so not able to do anything that can't be handled with SSH (esp. testing :( ).

[github-usr-name]

Reworked, still in progress - expanded resize looks OK, but there are some bugs relating to [1] minimum window size (needs to be validated recursively, not just at the resize level) & [2] mouse-based resizing permitting windows to exceed node area

[github-usr-name]

Any update on this please? I have somewhat under 2,000 lines of diff against master now that I'd really like to get merged which provide a lot of additional/missing functionality & bug fixes e.g. integration of floating window focus logic

[outfoxxed]

Sorry, the review request either didn't give me a notification or I didn't see it.