Preference System

[bbergen]

From here on most of these SDL projects will likely have some sort of persistent preferences, for example sound settings, high scores, or preferred resolutions.

It doesn't make sense to have to write a system to read and write these preferences to the file system for each individual project.

Add a new tool to the common directory with a header and implementation that manages reading and writing of persistent preferences to the file system.

The system should:

• Be encapsulated and hide its implementation
• Be ignorant of the exact nature of the preferences
• Be passed the location to read/write the preferences
• Provide a simple api that provides the following functions:
  • write(prefs)
  • read(prefs)
  • get(prefs, key)
  • put(prefs, key, value)
• As hinted at above, the preferences system should either function similarly to, or delegate to a hashmap behind the scenes.