New research - Farming

This release comes with the 18th technology - Farming

Unlocking farming will allow you to create a farm on any grass tile with no modifiers/decorators

Every 5 turns the farm will finish growing a source of wheat, that will then reset to the first growth stage and provide you with 2 science points

Along with this, I have some game optimisations in place to better render bigger maps.

Render Distance option in the settings so you can increase/reduce the total number of tiles rendered at once. Lowering this can drastically increase FPS on larger maps

Updated the pulsating sprites so that they will only move when within the specific radius of the centre of the screen. This helps increase general FPS

Slightly improved load times of maps by only loading each resource once

Modified the spacing in the research tree and provided some background colour to provide some indication of the different 'trees'