Consider more name change fallout from 'if' --> 'assert' rename

[dandclark]

#80 changed the keyword from if to assert. There are two other name changes to consider as follow-ups:

• Rename the proposal from "Import Conditions" to "Import Assertions"
• Rename ModuleRecord's [[Conditions]] fields to [[Assertions]]

Thoughts/objections/any other changes we're missing?

[xtuc]

We might want to update Mozilla's position

[dandclark]

Other parts of spec text also reference "conditions" (ConditionEntries, ConditionKey, AssertClauseToConditions...), so I'm renaming those as well in #88.

[dandclark]

I landed #88 and posted an update to mozilla/standards-positions#373 (if they want to change it I'll offer to submit a PR; I'm not sure if creating a PR against mozilla/standards-position as a non-Mozilla employee presumes too much 😄). So, closing this.

[xtuc]

@dandclark I think it's ok to do it, like I did mozilla/standards-positions#392. I'm happy to send a PR

[dandclark]

@xtuc Oh, I didn't notice it was done that way last time. Looks like dbaron beat us to it though: mozilla/standards-positions@da63152