Support for modpacks (#79)

**_WARNING_**: The config file has had breaking changes.
Add the following to the top of your config file at `~/.config/ferium/config.json` to migrate it:
```json
"active_modpack": 0,
"modpacks": [],
```

- Build workflow now runs when `Cargo.lock` is changed
- Improve `README.md` and add information about modpack subcommands
- Update clippy lints to be stricter
- Added `modpack` subcommand
  - Added integration tests for these too
- Moved `switch` subcommand to `profile switch`
- Added donation hints after adding a Modrinth mod
  - This is to sort of compensate for the fact that no ad revenue is given to mod authors if you use Ferium
- Downloading now shows the file size rather than the number of mods
  - _The progress bar is a liiiieeeeee_ (at first, but it stabilises later)
- Downloads are now stable for 100> mods
- Downloads now directly write to part files then rename the file to its proper name after downloading is finished. Part files will be deleted if found

Author: theRookieCoder

.github/workflows/build.yml

@@ -6,6 +6,7 @@ on:
     paths:
       - "**.rs"
       - "**.yml"
+      - "Cargo.lock"
   workflow_dispatch:
 
 jobs:

.gitignore

@@ -3,4 +3,6 @@
 /tests/configs/.json
 /tests/configs/running
 /tests/mods
+/tests/md_modpack
+/tests/cf_modpack
 .DS_Store

CHANGELOG.md

@@ -1,5 +1,30 @@
 # Changelog for Ferium
 
+## `v4.0.0`
+### 19.05.2022
+
+Support for Modrinth and CurseForge modpacks!
+
+**_WARNING_**: The config file has had breaking changes.
+Add the following to the top of your config file at `~/.config/ferium/config.json` to migrate it:
+```json
+"active_modpack": 0,
+"modpacks": [],
+```
+
+- Build workflow now runs when `Cargo.lock` is changed
+- Improve `README.md` and add information about modpack subcommands
+- Update clippy lints to be stricter
+- Added `modpack` subcommand
+  - Added integration tests for these too
+- Moved `switch` subcommand to `profile switch`
+- Added donation hints after adding a Modrinth mod
+  - This is to sort of compensate for the fact that no ad revenue is given to mod authors if you use Ferium
+- Downloading now shows the file size rather than the number of mods
+  - _The progress bar is a liiiieeeeee_ (at first, but it stabilises later)
+- Downloads are now stable for 100> mods
+- Downloads now directly write to part files then rename the file to its proper name after downloading is finished. Part files will be deleted if found
+
 ## `v3.28.7`
 ### 12.05.2022