* Update the developer road map document.
* Update the compiling KiCad from source document to reflect recent build
changes.
* Change Cairo library version to 1.8.8 to fix build issues on CentOS 6.
1. Fixed an assumption somebody originally made in the plugin that std::string had contiguous storage. This is not specced behavior pre C++11 so we gamble by calling .reserve() which should give a far better guarantee.
2. Added copy to clipboard information for curl
3. Removed some openssl references in compiling.md
4. Renamed struct vars to be uppercase to match "public var" code style policy
* Add note about 32-bit builds to MSYS2 the hard way section.
* Add known issues section for building on windows with MSYS2.
* Add 64-bit Boost 1.59 issue to MSYS2 issues section.
* Fix broken link to KiCad patches source path.
* Fix missing link to MinGW website.
* Add link to library dependency section in introduction.
* Add "Known Issues" section to document known build issues.
* Change command blocks from using ``` to delineate block and use indentation
instead. The ``` method seems to be broken on Doxygen 1.8.9.1 used by the
autobuilder. It also removes the line numbering which did not make sense
for commands that spanned multiple lines.
* Add compiling.md with most of the important information from the plain
text versions of platform specific compiling files.
* Remove the old plain text compiling files and folder.