Fixed bug where draggable markers weren't affecting functions earlier…

… in order within same frame

Version 0.1.0 dev -> alpha

Fixed build error (missing header) on Windows

Updated build instructions to reflect included glew

Fixed critical bug which broke implicit plotting,

caused by addition of polyline plotting

Do not throttle FPS when moving a slider

Changed version format

Implement OpenGL/Dear ImGui based GUI

Implemented instant extrema/intercept/intersection finding

Split evaluator code to several files, implemented symbolic derivatives,
improved expression simplification (optimization)

Fix +- keys on Windows, add parser quiet mode, display error on label