Full implementation of SalesHistory

[ParasK26]

In this, I work to implement file storage for the saleshistory, and some additional commands.

[coveralls]

Pull Request Test Coverage Report for Build 304

• 0 of 418 (0.0%) changed or added relevant lines in 26 files are covered.
• 22 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.3%) to 5.315%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/seedu/address/logic/commands/AddReminderCommand.java	0	1	0.0%
src/main/java/seedu/address/logic/commands/ViewAllRemindersCommand.java	0	1	0.0%
src/main/java/seedu/address/logic/parser/ParserUtil.java	0	1	0.0%
src/main/java/seedu/address/model/product/Product.java	0	1	0.0%
src/main/java/seedu/address/model/util/SampleDataUtil.java	0	1	0.0%
src/main/java/seedu/address/logic/commands/ThreadDueRemindersCommand.java	0	2	0.0%
src/main/java/seedu/address/logic/commands/ViewDueRemindersCommand.java	0	2	0.0%
src/main/java/seedu/address/model/UserPrefs.java	0	2	0.0%
src/main/java/seedu/address/model/timeidentifiedclass/exceptions/ProductQuantityMismatchException.java	0	2	0.0%
src/main/java/seedu/address/MainApp.java	0	4	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/main/java/seedu/address/logic/parser/AddReminderCommandParser.java	1	0.0%
src/main/java/seedu/address/logic/parser/FinishedReminderCommandParser.java	1	0.0%
src/main/java/seedu/address/logic/commands/FinishedReminderCommand.java	1	0.0%
src/main/java/seedu/address/storage/XmlAdaptedTransaction.java	3	0.0%
src/main/java/seedu/address/storage/StorageManager.java	3	0.0%
src/main/java/seedu/address/model/saleshistory/SalesHistory.java	5	0.0%
src/main/java/seedu/address/model/ModelManager.java	8	0.0%

Totals
Change from base Build 303:	-0.3%
Covered Lines:	179
Relevant Lines:	3368

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💛 - Coveralls