Could not for the life of me get any regex to properly strip the ANSI
escape sequences, so the text log will have to suffer with them, but the
ansihtml library is now used to render them into HTML.
"-H=windowsgui" disables stdout on Windows, and the io.Multiwriter used
for logging had stdout as it's first entry, which failed and caused
logging and line caching to be skipped. stdout is now removed from
the multiwriter in this situation. Other portion of the issue was
because crash reports had colons in their names, which Windows
doesn't like. Fixes#168.
The last 100 lines of logs are now cached, and when a crash occurs, they
are saved to a file in the temp directory ("/tmp" on *nix), and pretty
HTML version is also created and opened in the browser.
* Currently only handles panics, will be included in more places soon
* Copy button and button to generate a GH issue will be added
