v2.5 HTTP arrives!!

• support libcurl and use scyth3-c/curl-http-wrapper
• change code panel
• change button theme
• change output compile mode

What's Changed

• add footer and update tab behavior by @scyth3-c in #14
• add titles and the code is formated by @scyth3-c in #15
• Change aspect by @scyth3-c in #16
• prepare to v2.5 by @scyth3-c in #17
• update store.js by @scyth3-c in #18

Full Changelog: 2.0...2.5