Font readme: Added OpenFontIcons, tweaks, links, removed spaces (#2141)
Font readme: Added OpenFontIcons, tweaks, links, removed spaces (#2141)

bkaradzic/imgui,bkaradzic/imgui,ggtucker/imgui,cmaughan/imgui,Flix01/imgui,ggtucker/imgui,aimotive/imgui-glfw,burningreggae/imgui,aimotive/imgui-glfw,Flix01/imgui,Flix01/imgui,burningreggae/imgui,cmaughan/imgui,cmaughan/imgui,bkaradzic/imgui,ocornut/imgui,ocornut/imgui,cmaughan/imgui,nProtect/imgui,ggtucker/imgui,dougbinks/imgui,nProtect/imgui,ocornut/imgui,dougbinks/imgui,nProtect/imgui