Implement caching system

[Katsute]

Prerequisites

If all checks are not passed then the request will be closed

• I have checked that no other similar feature request already exists
• The feature request makes sense for the project

Proposal

Describe the feature that should be added

Implement caching for liveload

https://crunchify.com/how-to-create-a-simple-in-memory-cache-in-java-lightweight-cache/

Reasoning

Explain why this feature should be added

Efficiency and memory.

[Katsute]

When a file is first accessed:

• create a long with the expiry
• set the timer to a lower number if its lower than current

When the timer reached end:

• remove any files that passed expiry
• if lowest expiry passed reset to next lowest timer

If a file is reaccesed:

• reset expiry for that file

[Katsute]

Update file cache when the last modified time changes.

[Katsute]

A cache byte loading option could require a file cache adapter (and throw illegal args otherwise).

Parameter can be long millis or double and TimeUnit.

[Katsute]

Instead of a timer instead only clear cache on an exchange.
Have a long for the closest file expiry and then iterate through each file to clear bytes.

After read set expiry to -1 then use that to determine if to read file when accessed again.

[Katsute]

A timer will not be used because this would introduce some thread instability with multiple threads.