Code standard

[nmarquesin]

Issue Title

Our source code should adhere to a code standard. It improves code readability and increases code quality.

[teras]

This is true, also for the commit here: https://github.com/TotalCross/totalcross/commit/1893c59d4262ef7f19ca35b9a451c476cbf194c9 The patch uses spaces, while the code uses tabs.

I'd recommend to define a coding standard and apply it universally on the code, something with well defined "defaults" to be easier for people to submit code.