Editorconfig

- Fix potential buffer overflow in ec_glob (87)
- Add simple installation steps for Fedora (79)
- Update property key, value length limits per spec change (16d1d92395894b98c3aec81326361af934236ab7)

- Fix memory leak in editorconfig_parse() which would occur if no `.editorconfig` files were found in the file's ancestry or if an error occurred while ingesting values. 76

- Fix two OOM issues.
- Fix one buffer overflow issue.
- Fix one memory allocation error caused by strdup.
- Upgrade CMake minimum to 3.5.1.
- Other misc fixes.

- Bump required minimum cmake version to 2.8.12.
- Support pcre2 and drop support for pcre.

- Add support for pkgconfig.
- Memory leaks and crash fixes.
- Improve error messages.
- Add CI on AppVeyor.

Known issue:

- Test `utf_8_char` on AppVeyor won't pass.