Refactor buffer implementation to include FIFO & LIFO Variations

[Alokxk]

Changes:

• CTAbstractBuffer: Base class with common buffer functionality
• CTFIFOBuffer: First-In-First-Out buffer (Queue behavior)
• CTLIFOBuffer: Last-In-First-Out buffer (Stack behavior)

Testing:

• Added Tests for both FIFO and LIFO behaviors in CTBufferTest class

[coveralls]

Pull Request Test Coverage Report for Build 15641247937

Details

• 207 of 211 (98.1%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+4.8%) to 98.104%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/Containers-Buffer/CTAbstractBuffer.class.st	131	135	97.04%

Totals
Change from base Build 15580888910:	4.8%
Covered Lines:	207
Relevant Lines:	211

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💛 - Coveralls