Also improved combat actions and moved some calculations out of battlers and into the actions instead.

Fixed CoC link in README

After the filename of the CoC changed, the README was not updated.

Fix #88 - missing skills now decrease mana properly

I tried to simplify the code, shorten the player script
The DialogueBox now uses the pressed signal on buttons for better mouse and touch support in the future

closes #80

Update the changelog for v0.2.0

Add version number to the project

Remove Munro

I temporarily changed the colors, but the label will need more work. Maybe a bitmap font instead of actual text: there are some artifacts with scale animation

Make default.theme's panel background transparent
The panel now takes the width of the screen and anchors to the top of the window
closes #78

Refactor CircularButton to extend Button
Disable if Battler.can_use_skill is false
Closes #77

remove skill_to_use from base CombatAction class, move down to specialized SkillAction
rename skill_to_use -> skill

Also place them on the character's pawn at the start. They're not registered in the grid anymore so we can place them wherever we want
fix #72

closes #79

Added fixes based on Nathan's suggestions

Back on Par with Master

Slash still seems broken

Removed Print statements

Added Popup information with font #70 part 2

This replays the turn with the same battler, reopening the actions
select menu

Main changes:

- Simplified combat actions. Action handle the logic that relates to
their name. E.g. the attack-specific code is now in Attack.gd and not in
its parent class. Removed unused parameters. Removed actions selecting
their own target: this breaks the single responsibility principle (and
made the action code break when I changed stuff in the interface)
- Removed the old school UI and action_list code in favor of the
circular menu
- Almost all functions that dealed with one target now work with an
array of targets instead, even if the player only selects one target
- All commands should support working with multiple targets as a result

A lot of the changes I needed to make to accomodate for either feature
broke the game, so that's why I'm packing all the changes in a single
commit.

The button and tooltip depended on CircularMenu to initialize them properly. Now the tooltip will work with any button or control node. Also, the CircularButton works on its own, as it should: it doesn't need the menu to pass polar coordinates anymore.