Balancing Patch 2 and Quality of Life Changes

To make the game more playable, a few balancing changes have been made:

- Howitzer has been nerfed. Before the nerf, howitzer spamming was broken and could be used to win any level without much strategy.

- Flamethrower damage has been buffed again to make it usable despite its short range.

- Long cannon has been buffed slightly to allow it to partially replace the role of howitzers as a long-ranged unit.

- Both long cannon and autocannon bullet speed have been buffed slightly to allow them to better hit fast moving targets.

- Maps have been made slightly larger to make it easier for large groups of tanks or large tanks to fit through hallways. Levels have also been rebalanced according to these changes.

Quality of life:

- Tutorial has been revamped to (hopefully) make it easier to follow.

- Factories will no longer create a popup when hovered over; instead, they will now make a popup when clicked.  This should reduce the problem of accidentally opening the menu.