upgrade to ImGui 1.51 WIP#3

Open

ebachard wants to merge 16 commits intoscottmudge:masterfrom

ebachard:master

Commits on Aug 14, 2017

Fixed authoring and provided the exact color used in the screenshot
tot
committed

Commits on Aug 23, 2017

Commits on Nov 13, 2017

Commits on Apr 26, 2018

Simplified the code, now using more Dear Imgui themes + added a new LightGreen theme (inspired from linux Traditional Green gtk theme)
ebachard
committed
Added some information about the recent changes
ebachard
committed

Commits on Apr 30, 2018

Fixed wrong types for style variables
ebachard
committed

Commits on Jul 18, 2018

Resnc with Dear ImGui (1.63 WIP july 18th)
ebachard
committed

Commits on Aug 31, 2018

Now resync'ed with ImGui1.64
ebachard
committed

Commits on Oct 7, 2018

Update to ImGui 1.66
SR_team
authored

Commits on Oct 12, 2018

Merge pull request #1 from sr-tream/master
ebachard
authored