Release v0.1.2

• support struct embedding with field and method promotion
• support copy and append from a string into a byte slice
• support composite literals of nested struct arrays ([N][M]Point)
• support index keys in slice literals
• support unary plus (+) operator
• fix break inside a switch to exit the case instead of the enclosing loop
• fix range over slices of composite elements corrupting the last element
• fix struct variable overwritten after being stored in a slice
• fix assigning a struct value to a 2D struct array element
• fix indexing a nested array field or *[N][M]byte through a pointer
• fix multi-byte div mod fusion for constant divisor
• eliminate dead loops after any loop end, not just [-]