Add support for integer edge labels

[Harsh14901]

Fixes #4

• Created fresh template instances for Integer label types
• Abstract out a solve template function to handle any data type for labels and states
• Added an option vfe to parse the input file in VF format with integer edge labels.
• Fix hardcoded datatypes in dataloaders.
• Add command for compiling as a shared library in Makefile

PS: For easy reviewing please start review after the commit Reformat files

[zezewww]

Thank you so much for merging this branch! Fantastic work! I am so poor at C++, can't do it myself...

[RazviOverflow]

Wondering why this isn't merged in the main repo. Could be just another example of academia abandonware?