Major Improvements to the Native and Java code

[pavly-gerges]

This is a major PR addressing improvements in the following APIs:

• ErrnoToException: implemented a dynamic interpreter pattern.
• SerialMonitor: minimized app resources by keeping both read/write on the same thread.
• Permissions: implemented a full interpreter pattern for the POSIX file permissions.
• Semaphores: deprecated this trivial API and utilized the stock ReenterrantLock instead.
• TerminalFlag: implemented a full interpreter pattern for terminal flags API.
• NativeTerminalDevice: minimized resources by utilizing the smallest compatible types for terminal flags and read configuration attributes, and removed the faulty NativeTerminalDevice#readData() and int NativeTerminalDevice#getReadData().

And, adding new stuff:

• TerminalFlags API: interpreted POSIX input flags, local flags, control flags, and output flags into Java TerminalFlag objects.
• Permissions API: interpreted POSIX file permissions (file mode) into Java Permissions objects.