Fix memory leaks and add small features

Fixes

• Fixes a memory leak on wifi_change event
• Fixes a memory leak on space_change event with --bar sticky=off

New

• Add new circ animation function
• Add new option to supply custom config file via --config <path> or -c <path> at startup
• Add string property to all texts, i.e. icon=<string> is equivalent to icon.string=<string>

Full Changelog: v2.14.1...v2.14.2