Merge branch '21-implement-rv32i-instruction-set' into 'backend'

...ava/rars/riscv/instructionSets/InstructionInitialSet.java

app/src/main/java/rars/riscv/instructions/AND.java

app/src/main/java/rars/riscv/instructions/ANDI.java

app/src/main/java/rars/riscv/instructions/NOT.java

app/src/main/java/rars/riscv/instructions/OR.java

app/src/main/java/rars/riscv/instructions/ORI.java

app/src/main/java/rars/riscv/instructions/XOR.java

app/src/main/java/rars/riscv/instructions/XORI.java

app/src/test/java/rars/riscv/instructions/ANDITest.java

app/src/test/java/rars/riscv/instructions/ANDTest.java

app/src/test/java/rars/riscv/instructions/NOTTest.java

app/src/test/java/rars/riscv/instructions/ORITest.java

app/src/test/java/rars/riscv/instructions/ORTest.java

app/src/test/java/rars/riscv/instructions/XORITest.java

app/src/test/java/rars/riscv/instructions/XORTest.java