Config to Disable Rendering Items in Smeltery

[WaitingIdly]

• implements Config to disable rendering items in the Tinker's Construct Smeltery #419 via adding a config to stop the render function after it runs renderFluids.
• config defaults to -1, which is the default behavior
• it could also make sense to make the default value be a high but unobtrusive number, such as 1000, which would reduce the ability to have extreme lag.

[what-the-diff]

PR Summary

• Modification of README.md file
  Our instruction manual (README.md) has been updated to include details of a new feature for a section of our software called Tinkers' Construct. The feature was added to allow users to disable rendering (visual display) of certain items in a section of the software called the 'smeltery.' The reasoning behind this feature creation is to minimize lag or slow-down that occurs when these items are displayed.

• Enhanced UTConfigMods.java configuration
  The configuration file (UTConfigMods.java) for Tinkers' Construct was enhanced to include a new option for users. This allows them to determine the maximum number of items that can be visually displayed (rendered) in the smeltery at any time.

• Introduction of new file: SmelteryRendererMixin.java
  A brand new file titled 'SmelteryRendererMixin.java' has been added. The purpose of this file is to manage the visuals of fluids in the smeltery. Specifically, it will halt the display of these fluids whenever the total quantity in the smeltery inventory exceeds the pre-set maximum decided upon in the configuration.

• Update to mixins.mods.tconstruct.json file
  The 'mixins.mods.tconstruct.json' file has been updated to feature our newly added file (SmelteryRendererMixin) in the list of mixins. Mixins are typically a list of files or components that are being used in the software.