Added file input + stdin support

+ Files/stdin input can be binary or ascii
+ Handles piping from other programs
+ Misc test fixes
+ Updated readme
+ clippy + fmt

formats/example.toml

@@ -43,7 +43,6 @@ field_type = {type = "Float", endianness = "BigEndian"}
 # string field. Printed as a byte array
 [[formats.fields]]
 name = "string field"
-print_type = {print = "ByteArray"}
 field_type = {type = "String", endianness = "BigEndian", max_len = 55}
 
 # byte field