Signed-off-by: Alecto Irene Perez <perez.cs@pm.me>

This commit makes the default visibility hidden, and annotates the
necessary types and classes to be public

src/catch2/interfaces/catch_interfaces_enum_values_registry.hpp
src/catch2/interfaces/catch_interfaces_generatortracker.hpp
src/catch2/interfaces/catch_interfaces_registry_hub.hpp
src/catch2/interfaces/catch_interfaces_reporter_factory.hpp
src/catch2/interfaces/catch_interfaces_reporter_registry.hpp
src/catch2/interfaces/catch_interfaces_tag_alias_registry.hpp
src/catch2/internal/catch_case_insensitive_comparisons.hpp
src/catch2/internal/catch_fatal_condition_handler.cpp
src/catch2/internal/catch_fatal_condition_handler.hpp
src/catch2/internal/catch_istream.cpp
src/catch2/internal/catch_preprocessor_remove_parens.hpp
src/catch2/internal/catch_reusable_string_stream.hpp
src/catch2/internal/catch_test_case_registry_impl.cpp
src/catch2/internal/catch_test_case_registry_impl.hpp
src/catch2/matchers/catch_matchers_floating_point.hpp
src/catch2/matchers/internal/catch_matchers_combined_tu.cpp
src/catch2/reporters/catch_reporter_cumulative_base.cpp
src/catch2/reporters/catch_reporter_cumulative_base.hpp
src/catch2/reporters/catch_reporter_streaming_base.hpp
tests/ExtraTests/X04-DisabledExceptions-CustomHandler.cpp
tests/ExtraTests/X22-BenchmarksInCumulativeReporter.cpp
tests/ExtraTests/X26-ReporterPreferencesForPassingAssertionsIsRespected.cpp
tests/ExtraTests/X27-CapturedStdoutInTestCaseEvents.cpp
tests/ExtraTests/X28-ListenersGetEventsBeforeReporters.cpp
tests/SelfTest/Baselines/automake.sw.multi.approved.txt
tests/SelfTest/Baselines/compact.sw.multi.approved.txt
tests/SelfTest/Baselines/console.sw.multi.approved.txt
tests/SelfTest/Baselines/sonarqube.sw.multi.approved.txt
tests/SelfTest/Baselines/teamcity.sw.multi.approved.txt
tests/SelfTest/IntrospectiveTests/CmdLineHelpers.tests.cpp
tests/SelfTest/IntrospectiveTests/ColourImpl.tests.cpp
tests/SelfTest/IntrospectiveTests/Reporters.tests.cpp
tests/SelfTest/IntrospectiveTests/TestCaseInfoHasher.tests.cpp