GO: Serialization about kaitai_struct HOT 3 OPEN

kaitai_struct_go_runtime:

• add more function for compiler, make go translator like other language.
  • if case
  • err resolve
• add function to support writer

kaitai_struct_compiler:

• rewrite go translator supoprt writer

from kaitai_struct.

the changes we do:

• kaitai_struct_go_runtime

1. delete original reader and writer, and combined them into a new struct -> stream (like python and java's runtime)
2. for go, add a new rws(read, write, seek) buffer struct
3. for terminated string and bytes, add a new struct to describe them(util.go)

• kaitai_stricuct_compiler

1. splite common reader and common write into go reader and go writer (also works well for any other language)
2. rewrite go translator to support writer
3. complete functions in go compiler
4. some type conversions are fixed(support go's interface{})
5. clean up unuseful code generate

now we can use the compiler to generate go files which support serialize and unserialize

from kaitai_struct.

for terminated string and bytes, add a new struct to describe them

This change is used to calc length when write. We add this.SizeOf() to calc length of struct.

from kaitai_struct.