[fpc-devel] UPD1 cpstring proposals

[Alex Shishkin]

  My proposed changes to spstring.
  1) if string is defined w/o explicit encoding (f.e. just "string", in
  H+ modeswitch or "ansistring") it treated as RawByteString.
  2) In unicode Delphi mode encoding of all string constant values is
  forced to UTF16, source encoding can be any. String variables forced 
to UTF16.
But most unidode Delphi code could be compiled in simple Delphi mode.
  3) all RTL string routines should be encoding aware (accept 
RawByteString). No need to
separate unicode versions.

  4) UTF8String, RawByteString, UnicodeString are aliases but not unique 
types.
  5) concatenation of 2 rawbytestrings converts right operand to left`s 
encoding.
6) may be use concept of "universal string" from my previous message. 
"ansistring" (w/o explicit encoding) = RawByteString + clause "5".

In fine, main idea is to use rawbytestings as widely as possible, but 
avoid data corruption (perform codepage conversion when it absolutely 
necessary).