Smaller static

[Miha-x64]

Consuming less memory:
— replaced char[64] Base64.CA and byte[64] Base64IO.CA with a single shared byte[64] (-128 bytes)
— replaced int[256] Base64.IA with byte[256] (-768 bytes);
— removed some int-to-byte narrowing casts, added byte-to-char expanding ones.
Speed test is running a bit faster on my machine — 12 seconds instead of 13.

[brsanthu]

Hi, this is replica of code from other original source (but not treated as a fork). I would be hesitant to make this change here. Can you please propose this change in the original repo and then I can copy the change here?

[Miha-x64]

Hello.
Project at SourceForge does not look very alive.
Last release was in 2004, feature requests from 2007 and 2009 are still open.

[brsanthu]

Thank you for your feedback. May be, will merge this and release as new version along with new test PR.