automatically disable default-features if dependencies fail

add support for pkgconf version constraints - fixes #294

add missing shId() in feature var name

make FeatureType.default an xs:boolean - fixes #296

replace type="exec" with exec="true" - fixes #295

add simple SLF4J provider - fixes #292

some more code cleanup

first minor code improvements

add RegressionTest - fixes #264

fix missing initialization of CFLAGS and LDFLAGS when toolchain is unknown - fixes #288

(0) -10 +10 tip

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