Tools - none-cxxflags generator script & enable deprecation warnings (#9245)

* Tools - none-cxxflags generator script

GCC10 -> GCC (as in general, not specific to 10)
cpp -> cxx to be consistent with gcc terminology
grep exclude patterns in a separate file
exclude 'deprecated' warnings by default

* actually set warnings when compiling

--warnings=none is arduino-cli implicit default

tools/warnings/none-cxxflags

@@ -0,0 +1,58 @@
+-Wno-address-of-packed-member
+-Wno-aggressive-loop-optimizations
+-Wno-analyzer-double-fclose
+-Wno-analyzer-double-free
+-Wno-analyzer-exposure-through-output-file
+-Wno-analyzer-file-leak
+-Wno-analyzer-free-of-non-heap
+-Wno-analyzer-malloc-leak
+-Wno-analyzer-null-argument
+-Wno-analyzer-null-dereference
+-Wno-analyzer-possible-null-argument
+-Wno-analyzer-possible-null-dereference
+-Wno-analyzer-stale-setjmp-buffer
+-Wno-analyzer-tainted-array-index
+-Wno-analyzer-unsafe-call-within-signal-handler
+-Wno-analyzer-use-after-free
+-Wno-analyzer-use-of-pointer-in-stale-stack-frame
+-Wno-attributes
+-Wno-attribute-warning
+-Wno-builtin-declaration-mismatch
+-Wno-builtin-macro-redefined
+-Wno-cannot-profile
+-Wno-coverage-mismatch
+-Wno-cpp
+-Wno-div-by-zero
+-Wno-endif-labels
+-Wno-enum-compare
+-Wno-free-nonheap-object
+-Wno-hsa
+-Wno-if-not-aligned
+-Wno-ignored-attributes
+-Wno-int-to-pointer-cast
+-Wno-invalid-memory-model
+-Wno-long-long
+-Wno-lto-type-mismatch
+-Wno-main
+-Wno-missing-profile
+-Wno-narrowing
+-Wno-odr
+-Wno-overflow
+-Wno-packed-bitfield-compat
+-Wno-pointer-compare
+-Wno-pragmas
+-Wno-prio-ctor-dtor
+-Wno-psabi
+-Wno-return-local-addr
+-Wno-shift-count-negative
+-Wno-shift-count-overflow
+-Wno-shift-negative-value
+-Wno-sizeof-array-argument
+-Wno-switch-bool
+-Wno-switch-outside-range
+-Wno-switch-unreachable
+-Wno-sync-nand
+-Wno-trigraphs
+-Wno-unused-result
+-Wno-varargs
+-Wno-vla