add datasheet for SMD PTC fuse
rename device SIBA_194600 to PTC-FUSE and add metadata

this is a preparation for adding more packages to this new generic PTC
fuse device
add datasheets and adapt device description
add LP60-050 package for PTC fuse
Merge pull request #47 from LeSpocky/ptc-fuse

part PTC-FUSE and related packages/symbols