An experiment of float version of MewUI

[shonescript]

Hello @al6uiz ，
MewUI project use double as the value type for all graphic interfaces and controls.
As most backend tenchnologies (DX,GL) in GPU level use float, I did some experiment in the fork project (https://github.com/shonescript/MewUI), using float as the value type for all graphic interfaces and controls.
The advantage of float version is minimal memeroy usage and more performance (align with GPU). Athough the disavantage is a litte precison degrade in graphics expression, but this can be avoid by binding with double type of source geometry data or model.
Some changes made to MewUI library are follows:

• double -> float;
• Math. -> MathF.;
• x.x -> x.xf, such as 3.14 -> 3.14f; note many string in PathGeometry definition (PromptIcon, etc.) would be replaced together, need restore back.
• MathF.Clamp,Max,Min,Abs -> restore back Math;