Highlight C99/C+11 final typing in guide
Merge branch 'guide-ctypes-highlight-c99'
Add links for Duktape built-ins (top level)
Merge branch 'guide-builtins-links'
Ditz issue update
Add error handling to getting started examples
Add a guide section on error handling
API page reference to Error handling section
Add "protected" API call tags for safe calls
Fix duk_peval_file() broken tag
Add green color for protected API call tags
Merge branch 'improve-guide-error-handling'

Add error handling discussion to Getting started, and a new section on
Error handling (#error-handling).  Error handling has been quite confusing
for users, which was not helped by the Getting started examples NOT having
any error handling at all.

Also add a "protected" tag to safe API calls so that they're easy to link
to in the tag list.