Add 59 filaments (Spectrum)

[cristinarz98]

Update:

• PETG Premium High Speed (https://spectrumfilaments.com/en/filament/pet-g-premium-high-speed/)
• rPETG (https://spectrumfilaments.com/en/filament/r-petg/)
• S-Flex 85A™ (https://spectrumfilaments.com/en/filament/s-flex-85a/)
• S-Flex 90A™ (https://spectrumfilaments.com/en/filament/s-flex-90a/)
• S-Flex 98A™ (https://spectrumfilaments.com/en/filament/s-flex-98a/)
• S-Flex Carbon (https://spectrumfilaments.com/en/filament/s-flex-carbon/)

Added:

• Prografen PET-G Graphene Strong (https://spectrumfilaments.com/en/filament/prografen-petg-graphene-strong/)
• Prografen PET-G Graphene Light (https://spectrumfilaments.com/en/filament/prografen-petg-graphene-light/)
• PETG ESD (https://spectrumfilaments.com/en/filament/petg-esd/)
• PETG/PTFE (https://spectrumfilaments.com/en/filament/pet-g-ptfe/)

Also added:

• material properties
• missing packages with GTIN/EAN number and URLs
• removed URLs from materials
• added material type to S-Flex filaments (TPU)
• missing filament photos