3 issues fixed.

- `something()2` from now displays syntax error
- Fixed void-vars and void-params (now it's prohibited to create them)
- Fixed "return;"
Next 3 issues fixed.

- `void`-type casting is now invalid and prohibited
- Added comments into the code
- Small changes in command line
readme.md
First version of constants and some minor bugs

- Fixed a operator-or-value checking in ExpressionCompiler on parsing
identifiers (in stage 1)
- Fixed the stdlib code compilation script
- Closes #2
- About #2 - added new command-line option: -iconst
Constants, expression parser, optimizer, bytecode

- Small changes to constants
- New message for wrong parameter's type when calling functions
- New message for wrong type in assignments
- Added optimizations for 1-argument opcodes
- Added type check for operators: `+=`, `-=`, `*=` (...)
- Added global constants
- Fixed the `=` operator in code like: println(variable = 10);
- Fixed saving bytecode
- Fixed optimizer on fjmp/tjmp
- Fixed `do..while` loop
- Fixed `,` syntax checking
- Changed bytecode strings saving
Special constants

- Added a `special constants`:
-> `__selffunc`, string -> current function name, eg."main"
-> `__self`, string -> currently compiled file (absolute path)
-> `__compiler_version`, string -> string compiler version, eg."2.1"
-> `__compiler_iversion`, float -> compiler version, eg.`2.1`
-> `__line`, int -> current line
-> `__date`, string -> compilation date; format dd-mm-yyyy
-> `__time`, string -> compilation time; format hh:mm
-> They can be turned on by the `-sconst` switch
- Changed a bit `compile_all.bat`
- Finished `short_cast.ss`
- Small change in `readme.md`
Fixed typo in readme.md
readme.md #2
readme.md #3 ;P
readme.md #4

I think it's the last update of readme.md this day...
readme.md #5

Ok, so this is the last update od readme.md...
GitHub app for Windows a bit differetly displays this markup, than it's
on the GitHub.com
Fixed some operators' precedence

Fixed precedence of operators: `!=`, `>>=, `<<=`
readme.md
Fixed `RemoveRedundantPushed`

- Fixed `RemoveRedundantPushes`
- Small fixes in code
/build