1. Fix memory leak caused by incorrect zval allocation
2. Sort dictionary by keys when encoding (thanks @ttys3 Frederick888#8)
3. Fix segfault when parsing malformed Bencode integers, e.g. i10 (missing e at the end)
4. Code style (.clang-format, clearer project structure)
5. Various chores (correctly configure valgrind in CI, test against PHP 7.4, etc.)

Catch exceptions and return null in such scenarios (thanks @ttys3 Frederick888#5)

1. Simplify source codes
2. Less memory usage

1. Fix null character handling (thanks @DJATOM Frederick888#2)
2. Improve tests
3. Update Travis script

1. Fix pointer abuse
2. Upgrade license

1. search() method now allows you to search through the Bencode tree
2. Test cases added. Now you can use make test to verify the correctness of your build
3. Bug fixes (segfault, negative number parsing and etc.)

1. New feature: set_path/get_path/get_path_copy/del_path
2. Fix bug when namespace registration enabled

use zend_register_internal_class_ex to register parent