Change Compound Curve Tool construction sequence

改变3圆工具的建设顺序

change radius min from 4 to 2

Fix "If texture quality is not high, icon is blur"

Change ICON.png to Icon.png for linux user.
Update translation

Update de es fr language
Remove too short segment.
Change radius +-step from 1 to 0.5

1. Optimize curve algorithm
2. Remove redundancy code
3. Add option to change road node gap which tool built.

1. Optimize curve algorithm
2. Remove redundancy code
3. Add option to change road node gap which tool built.

Update Korean (Thanks for TwotoolusFLY LSh.st`s help)

Hotfix:

fix translation issue

1.After build one curve, tools will not exit.
2.Update for CSUR2.0
3.Missing harmony lib in release folder