Offline first (#142)

[FlorianPix]

• refactored main page; removed login start page;

• fixed missing login;

• removed redundant indexChanger;

• renamed package;

• added own app icon;

• refactoring common components;

• only show cache content and sync manually;

• caching for images;

• await sync;

• added Loading Animation while syncing;

• wip in cache;

• wip trip cache management;

• wip trip cache management;

• wip single-pitch-route cache management;

• wip cache management;

• wip cache management;

• wip cache management;

• wip cache management;

• wip cache management;

• wip cache management;

• wip cache management;

• wip cache management;

• _id is set by frontend; str instead of ObjectId;

• removed "updated" API;

• wip;

• fixed media service;

• wip;

• fixed duplication error when adding an existing spot to a trip;

• automatically remove media of deleted things in backend;

• do not add media to deletion queue if the parent is deleted (media is deleted automatically on the server if the parent is deleted)

• wip;

• wip;

• wip;

• improved import/export;

• wip migration;

• wip migration;

• deleted things that were deleted on the server after applying local changes;

• adjusted tests to new API;

• added missing awaits;

• switched to media-small endpoint in getMedia;

• added migration from objectId to str;