Remove deprecated std::binary_function inheritance for C++17 compatibility (#56)

## Summary
- Necessary to make it work ->
oxeanbits/parsec-web#2
- Remove `std::binary_function<TString, TString, bool>` inheritance from
`SortByLength` struct in `parser/suSortPred.h`
- Fixes C++17 compatibility issue where `std::binary_function` was
removed from the standard
- Enables WebAssembly compilation which requires modern C++ standards
- Updates `README.md` with a muuuch better version of it

## Details
The `std::binary_function` base class was deprecated in C++11 and
removed in C++17. The `SortByLength` functor doesn't need this
inheritance as it already provides the required `operator()` method.
This change maintains full functionality while ensuring compatibility
with C++17 and later standards, which is necessary for WebAssembly
compilation.

## Test plan
- [x] Verify compilation succeeds with C++17
- [x] Confirm WebAssembly build works
- [x] Ensure existing functionality remains unchanged

Author: Victorcorcos

parser/suSortPred.h

@@ -44,7 +44,6 @@ namespace su
     */
     template<class TString>
 	  struct SortByLength
-      :public std::binary_function<TString, TString, bool>
 	  {	
 	    bool operator()(const TString& a_sLeft, const TString& a_sRight) const
       {