* SubPlots: Y axis padding over multiple plots

* Align Plots Group

new signature ID, ImPool  to store padding data, demo

* Align plots orientation (vertically, horizontally)

vertical will align Y axis, horizontal will align X axis.
*signature changed

* ImPlotOrientation used as flag for 2D grids of aligned plots

https://github.com/epezent/implot/pull/144#issuecomment-725849368



* AlignPlots updates to merge with v.0.9

* Sync to v0.9 20210127

* subplots proto

* make link flags work

* stuff

* add multi-line centered titles

* subplots work

* flag ideas

* better subplot positioning

* resizable subplots

* subplot shared items

* subplot ratios

* some cleanup and refactor

* some cleanup and refactor

* refactors and demo reorganization

* context menus...almost done!

* context menus, bug fixes

* active id

* make implot use ButtonBehavior throughout

* bug fixes

* more bug fixes

* tweaks

* fix id issue

* finish work on subplots

Co-authored-by: ozlb <ozlb@users.noreply.github.com>

When painting a graph with densely labeled ticks on the X axis, it may be
necessary to add newlines in the labels to avoid label text overlap.

Reserve appropriate padding space for that.

* add SetNextPlotFormat

* work on pruning

* finish up fmt

* prototyping enhanced dnd features

* improve dnd demo using new utils

* dnd stuff

* finish up dnd improvements

* remove unused code, fix timestamps