Added assert, ensure and require snippets

Signed-off-by: Luxxuor <lukas.reuter.lr@gmail.com>
Added debug, CCode Description tag, read_line and scanf snippets

Signed-off-by: Luxxuor <lukas.reuter.lr@gmail.com>
Fixed DBus, class and closure snippets

Signed-off-by: Luxxuor <lukas.reuter.lr@gmail.com>
Fixed markup color of "this" and "base". Added some missing keywords.

Signed-off-by: Luxxuor <lukas.reuter.lr@gmail.com>
Fixed regex for error detection, should now detect the correct output.
Added new build target "Install".

Signed-off-by: Luxxuor <lukas.reuter.lr@gmail.com>