memory override attempt #2

minor fixes

Added InputFloat4(), SliderFloat4() helpers.

Invisible child windows gets clipped earlier in the pipeline.

Child window with inverted clip rectangles are marked as collapsed.

Reduce inner window clipping to take account for the extend of CollapsingHeader ...

from arikwestbrook

Allowing the user to call NewFrame() multiple times without calling Render() ...

Note that this is never a good idea. But, allowing it reduce confusion
in the initial stage of setup.

Fix clipping of title bar text.

Minor todo/readme changes

argh, removed redundent defines

removed memory pools, they dont apply well

fixed a typo

merge with upstream

First attempt at memory management

Fixed floating-point precision issue making the right-side value of a plot sometimes wrap to the left-side value.

PlotLines(), PlotHistogram(): added a stride parameter.

Slowed down mouse wheel scrolling speed in combo boxes

TreeNode/CollapsingHeader ignore clicks when CTRL or SHFIT are held + make default button hover brighter

Added storage for up to 5 mouse buttons for convenience (even though ImGui itself only uses 1)

Added BeginTooltip()/EndTooltip() helpers to create tooltips with custom widgets

Added TODO list items from users feedback

Added TextColored() helper. Changed some parameters to const references (still allows implicit casting)

Fixed trailing \n reporting extra text height

Fix typo and speculative warning

Fix invalid .ini file data persistently saving back on next save

revert back to original

Fix tooltip data needlessly leaking into .ini file

:w ...

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merged with upste
Merge remote-tracking branch 'upstream/master'

Fix for doing multiple Begin()/End() during the same frame

Default "local only" clipboard handler on non-Windows platforms