tree_magic instead of tree_magic_mini

Dependencies

• [2] TVVW53HZ Conflict resolution
• [3] 246V5TYI decode existing files
• [4] JRENVH5D Reqwest 0.11
• [5] VO5OQW4W Removing anyhow in libpijul
• [6] 6HNRL5RT detect non-utf8 text files
• [7] NYOF5766 track file encoding in the record, including change text for file adds
• [8] UM5DLRPB store new non-UTF-8 files raw and decode to deplay the contents
• [9] I24UEJQL Various post-fire fixes
• [10] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [11] PDTUHOMV fix left over conflicts

Change contents

• replacement in libpijul/src/working_copy/mod.rs at line 36
  [3.243]→[3.352:407](∅→∅)
  − let mime = tree_magic_mini::from_u8(&uncoded);
  [3.243]

  [3.407]
  + let mime = tree_magic::from_u8(&uncoded);
• replacement in libpijul/Cargo.toml at line 119
  [3.730]→[2.2306:2332](∅→∅)
  − tree_magic_mini = "3.0.0"
  [3.730]

  [3.5897]
  + tree_magic = "0.2.0"