GRIFFIN: refactored insert statement implementation and tested exhaustively

GRIFFIN: tidy-up toString() invocations. I will cache those strings that are column or table names rather than making new string all the time.
GRIFFIN: assigned table name to InsertStatement so that it can be self-sufficient at execution time. Added tests for no timestamp and all partition types.
CAIRO: performance-optimised ByteSequence returned by VirtualMemory

GRIFFIN: removed duplicate code. Improved performance of symbol based filter, such as sym = 'XYZ' in cases where 'XYZ' does not exist. The cursor will not iterate over data if filter becomes constant.

GRIFFIN: timestamp_sequence() increment argument can be a function.

ALL: removed unused code

GRIFFIN: optimised 'and' and 'or' operators to recognise constant conditions better and avoid unnecessary data processing.
GRIFFIN: '=' impl for SYMBOL = CHAR, STRING = CHAR
GRIFFIN: 'sum' performance optimisation

Update README.md

NET: replaced constant boolean NOT logic when dealing with result of Net.bindUdp()

chore: refactored TextLoader to not throw JsonException. Classpath configuration is loaded just once now and exception is dealt with at the start of application (server or the one embedding questdb)

chore: renamed timestamp related classes to Timestamp*. Otherwise there is constant confusion over which class is being used.

GRIFFIN: refactored text loader not to depend on existence of JSON configuration at runtime. Such configuration is loaded in-memory as a separate step and text loader relies on parsed model at runtime.

CAIRO: bugfix - SymbolTable reload could produce an exception
NET: feature: ability to set multicast TTL and bind port for unicast

GRIFFIN: implementation of 'select count() from table' that would use result of base.size() when its available. This speed up exploratory 'count()' queries dramatically

Config: increased default map key capacity from 2k to 2M - this improves performance of group by queries

CUTLASS: minor restructuring of json query processor and major amount of tests - i would like to break "switch" statement, but before doing so I need a lot more tests for response continuity

CUTLASS: restructured Json query processor to break up phases of setting up new query and moving to next record. Wrote a bunch of tests to have harness before final refactoring. Reason for refactoring is to utilise RecordCursor.size() method.