Add options to disable "renaming"

[skylot]

This issue discussion started in #158.
Sometimes it is useful to view names "as-is" without any modifications.
So jadx must have an option for that.

For now, jadx has many "renaming" types besides deobfuscation:

• to support system case sensitivity
• to make valid java identifiers (to make code compilable)
• to remove not "printable" characters
  "printable" - here means only Latin chars (32 to 126 codes in ascii table)

Options must allow to disable/enable such types separately:

• In JadxArgs it must be enum set (full set is default)
• In jadx-cli list of lower case enum names with comma separator, plus shortcuts like all and none
  Examples: --rename-flags case,valid,printable or --rename-flags all
• In jadx-gui in must be several checkboxes under common label.
  And if some options is disabled before source export warning notification about changing names can be shown.

[asashour]

Should these settings apply to fields and methods as well?

[skylot]

@asashour yes, this must be done for fields and methods.