Bcmath Extended Versions Save

• removed support for php 7.1 7.2 7.3 #43
• fixed typos #43
• added code style checkers and phpstan #43
• added php 8.2 to tests #43
• used assertSame in test to make assert equals strict (@peter279k Tx!) #44

• fix: removed 0x from hexdec as was causing depreciation warnings #42
• fix: rounding half even not always returns correct values #41
• fix: cleanup return values for older php versions that crash on test -0/0
• added: php 8.1 in tests

• cleanup some old php 5.6 fixes
• added validation for powMod
• changed naming and params to be more in self explaining
• code optimisation

• changed self to static (#36)
• added ability to trim trailing zeros (#36)
• little code cleanup
• added phpunit 8, 9
• test providers now have strict types

• added half-even rounding (#34 )
• fix BC::pow with negative fractional exponent (#33 )

• added support for php 7.1 >= (#31, #30 )
• bcdiv will throw exception if you will try to make division by zero
• all result have trailing zero removed
• strict and hints added

Fixed trimming of trailing zeros and dot (leaving trailing zeros when no dot present). #29

• added bitwise xor, or and "and" #27
• readme update #20

• Added hexdec() and dechex() functions #25

• new methods log, exp, fact
• pow now supports fractional #22
• fmod - deprected, now we can use mod for floats
• powFractional - fix for null scale
• bcmod - completely changes because results where incorrect then expected
• powMod - better support for floats
• more test cases (compared with wolframalpha.com)