Metadata update!

- Added flag emojis to commands with countries.
- Added image attribution and description to "image" commands.
- Added file metadata to image resources.
- Added new key in options.py: pika.
- Added classes to deal with file metadata.
- Added common paths to common.py.
- Changed directory/file names of resources.
- Documented the new metadata format.

Fixes #83 - Metadata storage
Fixes #86 - Country flags

dev-notes/metadata-format.md

@@ -0,0 +1,24 @@
+# File metadata format
+
+Used for grouping info such as name, description, source, and such.
+
+
+## Format
+
+*`id` is the dictionary key, and the list items are the attributes for each files.*
+
+`meta.json`
+```json
+{
+    "id": ["filename", "name", "long_name", "description", "source", "emoji"]
+}
+```
+
+| Attribute     | Description                                     | Examples                                         |
+| ------------- | ----------------------------------------------- | ------------------------------------------------ |
+| `filename`    | The file name of the file, without the path.    | `ca.png`, `itu.png`                              |
+| `name`        | The name of the file.                           | `Canada`, `ITU Zones`                            |
+| `long_name`   | The long name (title) of the file.              | `Worldwide map of ITU Zones`                     |
+| `description` | The description accompanying the file.          | `Full radio allocations chart for all services.` |
+| `source`      | The source of the file.                         | `Instituto Federal de Telecomunicaciones (IFT)` |
+| `emoji`       | A Unicode emoji associated with the file.       | `📻`, `🇨🇦`                                       |