Twingle API 1.5-beta2

This release most notably features integration for twingle's shop functionality, which goes along with some useful improvements to profile management and several bug fixes. Huge thanks to @MarcMichalsky for this contribution!

Changes since Twingle API 1.4.0

• Create custom exceptions by @MarcMichalsky in #72
• Extend custom field mapping by @MarcMichalsky in #66
• Identify profiles by ID by @MarcMichalsky in #73
• Improve profile validation by @MarcMichalsky in #75
• Improve default profile behavior by @MarcMichalsky in #74
• Improve profile list view by @MarcMichalsky in #76
• Add generic payment method by @mariav0 in #68
• Do not require project IDs for default profile forms by @jensschuppe in #90
• fix #86 by @MarcMichalsky in #87
• Repair help links in settings form by @jensschuppe in #91
• Improve profile options for note creation by @MarcMichalsky in #88
• Add the organisation instead of the individual to donation receipts group by @jensschuppe in #94
• Some more fixed conditions by @MarcMichalsky in #92
• Improve API result values by @MarcMichalsky in #93
• Integrate Twingle Shop by @MarcMichalsky in #69
• Fix DAO/BAO namespaces and definitions by @jensschuppe in #99
• Fix form template issues (help texts, undefined template variables, etc.) by @jensschuppe in #100
• Update translation template and fix incorrect use of ts() by @jensschuppe in #101

Full Changelog: 1.4.0...1.5-beta2