Update three.js to r74

Updated affected examples as well.

Planets example click detection was refactored, as r74 raycaster seems
a lot slower than r71. Added a set of simpler dummy spheres to
massively speed up the click detection.

Change-Id: Idb07fccfa65a0b06277b215a7c5cc2c03a78e819
Reviewed-by: Tomi Korpipää <tomi.korpipaa@theqtcompany.com>
Reviewed-by: Pasi Keränen <pasi.keranen@theqtcompany.com>